Overseaming sewing-machine.



A. GRIEB. OVERSEAMING SEWING MACHINE.

APPLIOATION FILED JUNE 28, 1910. y

Patented Feb. 6,' 1912.

2 SHEETS-SHEET l.

coLUMmA PLANOGRAPH Cu.,\vAsH1NGTON. D. r

A. GRIEB. OVERSEAMING SEWING MACHINE. APPLICATION FILED 11111228, 1910.

1,016,488. Y Panentea'Feb. 6, 1912.

2 SHEETS-SHEET 2 UNITED STATES 'PATENT OFFICE.

ALFRED GRIEB, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFAC-TURING- COMPANY, A CORPORATION OF NEW JERSEY.

OVERSEAMING SEWIN G-MACI-IIN E.

Specification of Letters Patent.

To all whom t may concern.'

Beit known that I, ALFRED GRIEB, a citizen of the United States,residing at- Elizabeth, in the county of VUnion and State of New Jersey,have invented certain new and useful Improvements in OverseamingSewing-Machines, of which the following'is a specification, referencebeing had therein to A the accompanying drawings.

This invention has for its object to provide a simple and effectiveoverseaming stitch-forming mechanism of that class comprising a needleand loop-takers seizing needle-thread loops upon one side of the workand presenting loops for passage of the needle at the opposite side ofthe work.

The present improvement constitutes a specific form of the inventionforming the subject of my United States Patent N o. 931,058, datedAugust 17, 1909, and comprises a reciprocating needle and two loopers orthread-carriers either or both of which may be provided with an eye toreceive a looper-thread or may be formed with an open hook so as tomerely pass one thread loop through another.

In its present embodiment, the invention includes an eyed looper mountedupon a fixed fulcrum and adapted to seize a loop from the needle and topresent a loop of its own thread to a non-thread-carrying looper orspreader operatively connected therewith and mounted upon a movablefulcrum and actuated to present a loop of looper-thread for passage ofthe needle in its succeeding reciprocation. The two loopers havedifferential movements in parallel planes inclined to the needle path.

The invention will be understood by reference to the annexed drawings,in which- Figure 1 is a front side elevation of a sewing machineembodying the present improvements with the work-plate in section, Fig.2 a front end view of the same with the work-plate in section and theface-plate of the head of the bracket-arm removed, and Figs. 3 and 4 areperspective views showing the stitch-forming mechanism in differentpositions.

The machine comprises the frame including the base 1 from the rearwardportion of which rises the standard 2 carrying the overhanging arm 3with the head 4. The base is provided at the forward portion with thebearing member 5 formed with a seat upon which is secured the work-plate6.

Journaled in the base is the longitudinally extending main-shaft 7provided at the rearward end with the grooved beltpulley 8 andbalance-wheel 9 carrying the crank-pin 10 embraced by one end of thepitman l1 whose opposite end is connected with the crank-arm 12 of theneedle-actuating rock-shaft 13 whose forward end is provided with thecrank-arm 14 connected by means of the link 15 with a lateral stud uponthe collar 16 fixed upon the vertically reciprocating needle-bar 17 journaled in the head 4 and carrying the needle-clamp 18 in which issecured the eye-pointed needle 19. The main-shaft 7 is provided with theball-crank 20 embraced by the strap 21 of a `pitman 22 connected with astud 23 upon Ethe rearwardly extending arm 24 of a flooper-actuatingrock-lever mounted upon the fulcrum-stud 25 tapped in the base 1 andhaving a forwardly extending arm 26 which carries the fulcrum-stud 27upon which is gmounted the looper-lever 28 provided with the hooked ornon-thread-carrying looper- `blade 29 formed at its extremity with thedepending barb 29".

Mounted upon the xed fulcrum-stud 30 `carried by the rigid forwardlyextending arm 31 of the bearing member 5 is the boss 32 of the vibratinglooper-lever 33 formed at its outer or free end with the angularly`disposed looper-blade 34 having the loopseizing point or beak 35 andadjacent thread-eye 36 and the thread-eye 37 near its heel. Between thethread-eyes 36 and 37 the looper-blade 34 is bowed laterally toward theplane of movement of the looperblade 29 to form a lateralneedle-clearance recess 34X to enable the point of the needle indescending to enter the space between such recessed portion and thethread extending from the looper-eye 36 to the edge of the work so as toinsure the engagement of the looper thread by the needle at the propertime. The studs 25, 27 and 30 are arranged in parallel relation andinclined to the direction of movement of the needle-bar, andconsequently the loopers 29 and 34 are adapted for movement in parallelplanes inclined to the path of reciprocation of the needle 19. Thelooper-carrying levers 28 and 33, and hence the loopers 29 and 34, are

Patented Feb. 6, 1912.

usual presser-bar 39 surrounded by' the spring 40 interposed between theiXed collar 41 thereon and the perforated lug 42 embracing the samev andextending from a collar 43 swiveled to the lower end of the 4 adjustingscrew 44 mounted in the member 4.

The bar 39 carries at its lower end the presser-foot 45 opposed to whichis the feeddog 46 having the shank 47 secured upon the feed-bar 48connected at its rearward end by means of the pin 49 with an upright arm50 of the feed-rocker which is provided with the depending arm 5lpivotally connected with the eccentric-rod 52 whose strap 53 embracesthe adjustable feed-actuating eccentric 54 upon the'main-shaft.

The feed-bar is provided with the usual forked arm 55 embracing thefeed-lifting cam or eccentric 56 from which the rising and fallingmovements of the feed-dog are derived. Adjustably secured by means ofthe screw 57 in a suitable guideway of a depending lug 58X of alaterally adjustable guide-block 58 upon the frame member 5 is thestationary trimmer-blade 59 which coperates with the movabletrimmer-blade 60V formed with the slot 60 entered by the fastening screw61 by which it is adjustably secured upon the recessed seat formed inthe head 62 of. the angular vibratory cutter-lever 63 rigidly secured tothe transverse rock-shaft 64 mounted upon the conical-pointed bearingscrews 65 which are carried by the posts 66 rising from the base 1. Thecutter-lever 63 carries intermediate its ends the lateral stud 67embraced by one end of the eccentric-rod 68 having at its opposite endthe strap 69 embracing the cutter-actuating eccentric 70.

Secured upon'the rearwardly extending arm 24 of the looper-actuatingrock-lever by means of the screw 71 is the foot 72 of a vibratorylooper-thread take-up lever 73 having the thread-eye 74 in its upper orouter end, and movablertoward and from alinement with thread-eyes in theparallel ears 75 in the spaced members 76 of a fork at the upper end ofa thread-guide arm 7 7 adjustably secured by means of the screw 78entering a longitudinal slot 79 therein upon the vibratory cutter-lever63.

Mounted upon one of the bearing posts 66 is a shouldered tension-stud 80beneath which is disposed the washer 81 with lateral ears 82 each formedwith a thread-eye, the stud being provided with tension-disks 83 ofwhich the upper is pressed upon the lower by means of the spring 84interposed between the same and the nut 85 secured upon the threaded andsplit upper end of the stud.

The bracket-arm head 4 has adjustably secured upon its lower bearingmember by means of the screw 86 passing through a slot 87 therein theshank 88 of a forked threadguide having spaced perforated ears 89, andthe needle-bar 17 has secured thereon by means of the clamp-screw 90 thesplit collar 91 one of whose perforated flanges is extended forwardly toform a thread-engaging finger 92 adapted to pass between thethread-guiding ears 89 to deflect the needlethread passing through thesame. To the forward side of the bracket-arm 3 is applied the usualneedle-thread tension comprising the disks 93 between the outer of whichand the nut 94 upon the stud 95 is interposed the usual spring 96 forpressing the disks together.

In threading the machine, the needlethread o1, is led from the source ofsupply between the tension-disks 93, thence through the eyed take-upmembers 89 and downwardly to the needle-eye. The looperthread Z is ledfrom the source of supply through one of the apertured ears 82 betweenthe tension-disks 83, thence through the other apertured ear 82, andthrough one of the guide-lugs 75, the eye 74 of the takeup lever 73 andthe other guide-lug 75 to the eye 37 of the looper and thence to the eye36 adjacent the looper point.

Preparatory to the beginning of a stitchforming cycle, the parts are inthe positions represented in Figs. 1, 2 and 3, the needle being raisedand the 'eyed or secondary looper 34 being in its advance position atthe side of the needle path so as to embrace they latter between thelateral recess in its blade and the looper-thread leading from the eye3,6 backwardly to the edge of the fabric. As the point of the needlepasses below the eye of the threaded looper, the latter recedes and theprimary non-threaded looper descends and advances to extreme lowerposition upon the opposite side of the needle, at which time the partsassume the positions represented in Fig. 4. The primary looper thenstarts to recede and seizes a loop of needle-thread upon its barb, andcontinues its movement laterally and upwardly, during which the feed ofthe work takes place, and the needle-thread loop thus supported anddistended is entered by the point of the secondary looper which advancesto its eX- treme upper position to again present its thread to theneedle which has in the meantime risen to eXtreme upper position, thenon -threaded looper having cast off its needlethread loop upon thethreaded looper-blade in approaching its highest position above thelatters loop-presenting position. From this point the cycle of operationabove described is repeated.

During the descent of the needle and recession of the secondary looper84, the needlethread take-up arm 92 descends between the thread-guideeyes 89 so as to draw up the needle-thread in setting the previousstitch, while the looper-thread take-up arm 7 3 advances toward theguide-arm 77 to give up slack looper-thread. As the eyed secondarylooper begins its advance, the looper-thread take-up arm recedes fromthe thread-guide arm 77, and reaches its eXtreme retracted position justas the looper completes its advance movement, thus taking up the slacklooper-thread including that drawn through the tension in the retractionof the eyed looper. The thread-guide arm 77 is in practice so adjustedthat its guide-eyes are somewhat below the level of the eye 74 in thetake-up lever 7 3 when the latter is in its forward position, the looper34 in extreme retracted position, and the upper knife-blade 60 lowered,so as to increase the amount of slack looper-thread normally given up bythe take-up lever. When the lever 7 3 and knifeblade 60 are retracted toinitial position and the looper 34 advanced to loop-presenting position,as represented in Fig. 1, the rise vof the knife-bar 63 produces acorresponding rise in the thread-guides 75, so that the mounting of thelat-ter upon the knife-bar serves to insure an increased thread-drawingaction of the take-up for pulling up the eX- cess of looper-thread so asto hold the same taut for passage of the needle in its succeeding.descent.

Having thus set forth the nature of the invention, what I claim hereinis l. In an overseaming sewing machine, the combination with areciprocating needle, of thread-carriers mounted on parallel fulcra ofwhich one is fixed arid the other is movable and both are inclined tothe needle path, whereby one of said thread-carriers is adapted to takethread-loops from and the other to present thread-loops to the needleadjacent different eXtreme positions of the latter, actuating means forimparting to one of said thread-carriers both bodily and oscillatingmovements upon the movable fulcrum, and an operative connection betweensaid threadcarriers whereby said actuating' means are caused to impartto the other of said threadcarriers operative movements upon the fixedfulcrum.

2. In an overseaming sewing machine, the combination with areciprocating needle, of an eyed looper and a non-thread-carryinglooper, one being adapted to seize threadloops from the needle in oneposition of the same and the other to take thread-loops therefrom and topresent thread-loops to the needle in a different position of thelatter, a fixed fulcrum upon which said eyed looper is mounted foroperative movement, a movable fulcrum upon which said non-threadcarryinglooper has both bodily and oscillatory movements in a plane parallelwith that of the eyed looper movements, an operative connection between'said eyed and nonthread-carrying looper whereby operative movements ofthe one are derived from the other, and actuating means for thenonthread-carrying looper.

3. In an overseaming sewing machine, the combination with areciprocating needle, of a non-thread-carrying looper adapted to seizet-hread-loops from the needle, an eyed looper adapted to seizethread-loops from the non-thread-carrying looper and to present loops ofits own thread for passage of t-he needle, a fixed fulcrum upon whichsaid eyed looper is mounted for operative movement, a movable fulcrumupon which said non-thread-carrying looper has both bodily andoscillatory movements in a plane parallel with that of said eyed looper,an operative connection between said eyed and nonthread-carrying looperswhereby operative movements of the one are derived from the other, andactuating means 'for the nonthread-carrying looper.

4. In an overseaming sewing machine, the combination with a worl-support and a reciprocating needle, of a looper adapted' to presentthread-loops for passage of theneedle, a ned fulcrum disposed at oneside of the work-support and upon which said looper is mounted formovement in a circular path, a barbed looper adapted to seizethread-loops from the needle and present them for engagement by thefirst-named looper, a movable fulcrum sustained at the same side of thework-support as the xed fulcrum and upon which the barbed looper ismounted for movement in a path crossing that of the other looper andextending from theloop-seizing point upon one side of the fabric to aposition at the other side of the fabric beyond the extremeloop-presenting position ofthe other looper, and means for actuating thesaid loopers in the production of overseam stitches.

5. In an overseaming sewing machine, the combination with areciprocating needle, of two loopers whereby thread-loops may berespectively taken from and presented to the needle adjacent eXtremepositions of the latter, of a fixed fulcrum upon which one of saidloopers is mounted, a rock-lever mounted upon a fixed fulcrum, means forimparting rocking movements to the same, a fulcrum for the other loopercarried by said rock-lever, and a pivotal connection between saidloopers.

6. In an overseaming sewing machine, the combination with areciprocating needle, of

two looper-levers each carrying a looper adapted to coperate with theother looper and the needle in the production of Voverseam stitches, afixed fulcrum for one of said looper-levers, a rock-lever mounted upon aiXed fulcrum, means orimparting rocking movements to the same, a fulcrumfor the other looper-lever carried by said rock-lever, and a stud forpivotally connecting together said looper levers for cooperativemovement.

"1'.y In an overseaming sewing machine, the combination with areciprocating needle, of two loopers, one of which is eye-pointed,whereby thread-loops may be respectively taken from and presented to theneedle adjacent eXtreme positions of the latter, of a fixed fulcrum uponwhich one of vsaid loopers is mounted, a rock-lever mounted upon a fixedfulcrum, means for imparting rocking movements to the same, a fulcrumfor the other looper carried by said rock-lever, a pivotal connectionbetween said loopers, trimming mechanism includingra vibratoryknife-carrying lever, spaced thread-guiding eyes mounted upon saidlever, and a looperthread take-up lever mounted upon and movable withsaid rock-lever and having a thread-eye movable toward and fromalinement with said spaced thread-guiding eyes.

8. In an overseaming sewing machine, the combination with areciprocating needle, of two loopers, one of which is eye-pointed,whereby thread-loops may be respectively taken from and presented to theneedle adjacent eXtreme positions of the latter, of a fixed fulcrum uponwhich one of said loopers is mounted, a rock-lever mounted upon a fixedfulcrum, means for imparting rocking movements to the same, a fulcrumfor the other looper carried by said rock-lever,l a pivotal connectionbetween said loopers, trimming mechanism including a vibratoryknife-carrying lever, a rigid arm mounted upon and transverselyadjustable in the direction of vibratory movement of the knifecarryinglever and provided with spaced thread-guiding eyes, and a looper-t ireadtake-up lever mounted upon and movable with said rock-lever and having athreadeye movable toward and from alinement with said spacedthread-guiding eyes.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

ALFRED GRIEB.

Witnesses HENRY J. MILLER, HENRY A. KORNEMANN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

